BAT is brown in colour due to  

Options

A. more no. of lipid droplets
B. numerous mitrochondria
C. numerous pigmented cells
D. numerous blood vessels

Answer

To determine why bat (brown adipose tissue) is brown in color, we can analyze the options given in the question. Here’s a step-by-step solution:

### Step 1: Understand what BAT is
BAT stands for brown adipose tissue, which is a type of adipose (fat) tissue found in mammals. It plays a crucial role in thermogenesis, especially in cold conditions.

**Hint:** Remember that BAT is specifically related to thermogenesis and is different from white adipose tissue.

### Step 2: Identify the characteristics of BAT
Brown adipose tissue contains numerous mitochondria and is rich in iron-containing cytochromes. These characteristics are essential for its function in heat generation.

**Hint:** Focus on the components that contribute to the color of the tissue.

### Step 3: Analyze the options
1. **Numerous lipid droplets** - While BAT does contain lipid droplets, they do not contribute to the brown color.
2. **Numerous mitochondria** - This is a key characteristic of BAT. The mitochondria contain iron-containing cytochromes, which give the tissue its brown color.
3. **Numerous pigmented cells** - This is not true for BAT; the color is not due to pigmented cells.
4. **Numerous blood vessels** - While blood vessels are present, they do not contribute to the brown color of the tissue.

**Hint:** Look for the option that directly relates to the pigmentation of the tissue.

### Step 4: Conclusion
The correct answer is **numerous mitochondria**, as the presence of iron-containing cytochromes in the mitochondria is what gives brown adipose tissue its characteristic brown color.

**Final Answer:** Numerous mitochondria.